My friend I have owned many a boot looking for warmth since I not only deer hunt in the winter cold, but I ice fish where your standing on the ice all day long. And in all my 68 yrs. I have only found one boot I would bet on keeping anyone's feet warm. And that is the military Mickey Mouse Boot! they not only keep your feet warm, but they are still light enough not to tire you down when you walk. I wear 1 pair of wool socks with them, & my feet stay toasty warm. I even had my foot slip into a hole in the ice getting my left foot wet. I took off the boot drained the water put the sock back on after wringing it out & put them both back on & figured when I couldn't take it anymore I would get off the ice. But I fished the rest of the day and my foot continued to make heat even though my foot was wet. Research them my friend I am not a salesman for them but just believe in a Great product. Now they make a generic type of boot that comes from Korea, I think or one of those countries overseas. But you can tell they are much bigger than a real Mickey Mouse Boot, & usually the generic is black in color,( AND THEY ARE JUNK). Mine are white with air valves on the outside of the boots next to the heal part of your boot. Although I have see M/M/B in black they will look just like the white ones same size, & weight. Hope this helps you didn't mean to type a book but I also know how aggravating, expensive it is to find the right boots.